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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Schedule Of Assets-held-for Sale [Table Text Block]
A summary of the assets and liabilities held for sale on our condensed consolidated balance sheets as of September 30, 2013 and December 31, 2012 is detailed below.
 
 
September 30,
2013
 
December 31,
2012
 
 
($ in millions)
Accounts receivable
 
$
—

 
$
4

Current assets held for sale
 
$
—

 
$
4

 
 
 
 
 
Natural gas gathering systems and treating plants, net of accumulated depreciation
 
$
10

 
$
352

Oilfield services equipment, net of accumulated depreciation
 
26

 
27

Compressors, net of accumulated depreciation
 
242

 
—

Buildings and land, net of accumulated depreciation
 
319

 
255

Property and equipment held for sale, net
 
$
597

 
$
634

 
 
 
 
 
Accounts payable
 
$
—

 
$
4

Accrued liabilities
 
—

 
17

Current liabilities held for sale
 
$
—

 
$
21
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Income (Loss)
For the Current Period, changes in accumulated other comprehensive income (loss) by component, net of tax, are detailed below.
 
 
Net Gains
(Losses) on
Cash Flow
Hedges
 
Net Gains
(Losses)
on
Investments
 
Total
 
 
($ in millions)
Balance, December 31, 2012
 
$
(189
)
 
$
7

 
$
(182
)
Other comprehensive income before reclassifications
 
2

 
(6
)
 
(4
)
Amounts reclassified from accumulated other comprehensive income
 
13

 
4

 
17

Net current period other comprehensive income
 
15

 
(2
)
 
13

Balance, September 30, 2013
 
$
(174
)
 
$
5

 
$
(169
)
A reconciliation of the changes of accumulated other comprehensive income (loss) in the condensed consolidated statements of stockholders’ equity related to our cash flow hedges is presented below. 
 
 
Three Months Ended
September 30,
 
 
2013
 
2012
 
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
 
($ in millions)
Balance, beginning of period
 
$
(286
)
 
$
(178
)
 
$
(306
)
 
$
(190
)
Net change in fair value
 
3

 
2

 
4

 
3

(Gains) losses reclassified to income
 
3

 
2

 
(9
)
 
(6
)
Balance, end of period
 
$
(280
)
 
$
(174
)
 
$
(311
)
 
$
(193
)
 
 
Nine Months Ended
September 30,
 
 
2013
 
2012
 
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
 
($ in millions)
Balance, beginning of period
 
$
(304
)
 
$
(189
)
 
$
(287
)
 
$
(178
)
Net change in fair value
 
3

 
2

 
4

 
3

(Gains) losses reclassified to income
 
21

 
13

 
(28
)
 
(18
)
Balance, end of period
 
$
(280
)
 
$
(174
)
 
$
(311
)
 
$
(193
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
For the Current Quarter and the Current Period, amounts reclassified from accumulated other comprehensive income (loss), net of tax, into the condensed consolidated statement of operations are detailed below.
Details About Accumulated
Other Comprehensive
Income (Loss) Components
 
Affected Line Item
in the Statement
Where Net Income is Presented
 
Three Months Ended
September 30, 2013
 
Nine Months Ended
September 30, 2013
 
 
 
 
($ in millions)
Net losses on cash flow hedges:
 
 
 
 
 
 
Commodity contracts
 
Natural gas, oil and NGL revenues
 
$
2

 
$
13

Investments:
 
 
 
 
 
 
Impairment of investment
 
Impairment of investment
 
—

 
6

Sale of investment
 
Gain on sale of investment
 
(2
)
 
(2
)
Total reclassifications
for the period, net of tax
 
$
—

 
$
17